Weft detector for looms



June 8,1926. 1,587,908

E. R. HOLMES WEFT DETECTOR FOR LOOMS Filed Sept. 2 4; 1924 i mi j Patented June 8, 1926.

UNITED STATES PATENT iiFICE.

ELBRIDGE n. nomi/ins, or Wononsrnit, Messner-inserire, Assrenon 'ro onor/irren @a KNoWLEs Loom woieirs, or wcnoesrna, Messner-ressens, n CORPORATION oF MASSACHUSETTS.

WEET BETECTGIR FOR LOOMS.

Application led September 24, 1924. Serial No. 739,697.

rlhis invention relates to improvements in weft detectors for looms and more particularly to detectors for use with fine yarns. It has been found that the usual forms of detectors are likely to chafe fine yarns hecause of the fact that bohbius wound with yarn of the finer counts are presented to the detector mechanism a great many times bcfore a transfer takes place. Y

It is the generalobject of my present invention to provide a shieid which will per mit the detecting surface to contact with theI yarn on theV bobbin at a slower rate of speed than that at which the bobbin is advancing to lessen the impact of the yarn against the detecting surface.

It is a more particular object of my invention' to provide a detector with a shield which will normally extend beyond thcdete'ctin'g surface to prevent engagement of the saine with the yarn but which through the intermediary ofv differential gearing wi-ll permit engagement with the yarn by the detectsurfacel and thenY move forwardly therefrom tofpcrmit theA said detecting surface t act.

A stillfurther object of my invention is to provid'ea detector shield having an initial forward rate of movement equal to that of thebobbin'- and thereafter having a rela-tively faster movement.

Yi-th these and other objects in view which. will appear as the description proceeds, my invention resides in the co1nliinatioir andar 'angement of parts hereinafter described and set forthv in the claims.

ln the accompanying drawings,

Fig. 1 isf a side elevation of a weft detecting mechanism having my invention applied thereto, v

Fg. 2 isl a top plan viewof the mechanism shown. in Fig. 1,. partly in` section, showing the detectork parts in normal position,

Fie. 3' is. a diagrammatic view ofI certain parts shown in Fig. 2 with'l theY detector parts in the position they assume when the shield is moved out of shielding position and the direct thrust of the bobbin is against the detecting surface on a nonLindicating pick,

Fig. if is a. view similar to Fig. 3 showing the detector in` extreme forward positionV with the-partsfin indicating: position, and

l Fig is a vertical section on line {5f-'5 of Fig'. 2.. Y

Referring. to the drawings it will he' seen that l have provided a frame in which is mounted a bolt 11 which supports the feeler bed 12 adjusted as to vertical position vby screw 13 in stand 10. A shaft 14C is iour naled in the frame 10 and has upstanding therefrom an arm 15 fixed thereto and tending normally to move to the right as shown 1n if 1 by a spring 16 havingthe ends thereof located in the hub of lever 15 ane fixed part of the stand l0, respectively. liever l? is also secured to shaft 1d and has pivotal connection withV a controller pin 18 passing through slot 19 in a portion ofthe stand 10 and normally lyingun'der and in the path of an actuator20. TVhcn the controller 18 fails to move from under" the actuator 20, the latter operates through mechanism not shown' to effect a change in the running weft. Y

The bed 12 is receive a` detector' carrier 22 which is of tubular construction and from th'erear end of which extends a detector 23 fixed thereto. fr second detectorV 24 is pivoted at 25V to the carrier 22 and has a roughened detecting surface thereon defined by teeth proportioned to be embedded in the yarn of the bobbin to be detected. rlhe forward end of the detector 2a is provided with an offset arm 27 the forward side of which is'engaged by a rod 28 and the rear end of which is in Contact with the hooked end 29 of a second rod 30. Guide bearings 31 on the'rods 30a-nd 32 on the carrier 22 are provided for the rod 28. Said rod is acted upon by lever 15 and d the rear motion of the rod' 30 is limited by set' screw 33 normally in contact with the adgacent portion of .the bed 12. The matt-er thus far described is of the usual construction and may be made as set forth in Patent- My invention relates more partieularlyv to the shield or. pad which takes the blow of the bobhin B and acts 'through intermediate mechanism to permit the teeth 26 to sinflr intov the yarn. at a rela-tively low rate of speed. Accordingly, l provide a. slide i0 which fits over carrier 22 and has a oohbin engaging shield 41. Rack teeth` are carried the slide i0 and rack teeth 43 are mounted: on

the carrier 22. The said racks are of different heights to engage pinions of different diameters, r c'kfir-2 being in meshl withj pinion t; and rack 43 meshingwith pinion 4 Said pinions are secured together and-are jou-rs' arovided with a slot 21 to naled for free rotation in an arm 46 eX- tending rearwardly from the cap 46 secured to the bed. Because of the dierent diameters of the pinions 44 and 45 the slide 40 will move faster than the carrier 22.

In order to prevent side motion of the detector 24 before the saine has moved into complete contact with the yarn in the bobbin I provide a dog 47 pivoted as at 48 to the slide 4() and having an arm 49 extending beyond the slide and engaging the outer por tion thereof as indicated in Fig. 2. In order to hold the dog in normal position I provide a spring plunger o() having a head 51 received by a depression in the 'dog and serving normally to hold the dog opposite a lug 52 formed on the detector 24. A spring 53 surrounds plunger 5G and lies between the head 51 and a guide 54 carried by the slide 40.

Under normal conditions the parts will be in the position shown in F ig. 2 with the shield 4l lying rearwardly of the detectors 23 and 24 and the controller' pin 18 lying under actuator 20. As the bobbin engages the shield 4l the slide 40 and rack 42 will be moved forwardly to turn the pinions 44 and 45. The detector slide 22 will therefore move forwardly at a slower rate of speed than the bobbin and as the latter approaches the detectors they will be embedded in the yarn. This action will continue until the thrust of the bobbin is transferred from the shield 4l to the detector 24 at which time the detectors and their carrier will begin to move forwardly at the same rate of speed as that at which the bobbin is advancing. Thereafter the slide 40 will move away from the bobbin and forwardly at a relatively faster rate of speed than the carrier is moving thereby moving dog 47 away from lug 52 and permitting the detectors to receive the same operative movement from the bobbin 'as is had by the detector set forth in the aforesaid patent.

Should sufficient yarn be present the detector 24 will be held against rotation in a left hand direction about pivot 25 as shown in Fig. 3, and as the bobbin advances controller 18 will move from under actuator 20. Should insufficient yarn be present for continued weaving the pressure of rod 28 against arm 27 will be unresisted by the yarn and the detector 24 will. try to move to the left but will be prevented from doing so nntil the. dog 47 has moved away from lug 52, at which time the detector will be free to move and rod 18 will remain under the actuator 20. As the latter descends it will engage the controller and more about the same as a pivot to give an indication for change of operation in the loom.

From the foregoing it will be seen that I have provided a detector for use with fine yarn wherein the detecting surface is presented to the yarn at a slower rate of speed than that at which the yarn or surface to be detected is moved. Thus the rongliened surface of the detector is embedded between the turns of filling wit-hout subjecting the latter to a sudden blow. It will also be seen that at the time thedetector is called upon to give an indicating movement the shield has been moved forwardly so as not to interfere in any way with the operation of the detector and that thereleasing of the detector 24 by the moving of the dog 47 out of alignment with lug 52 gives the detector a sudden release so that. although the teeth 26 have entered the yarn at a comparatively lov7 rate of speed yet the detector is released at the proper time to have the same motion that is characteristic of the detectors er this general type now in use.

Having thus described my invention it will be apparent that changes and'modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

l. In a weft detector for looms, a detecting surface, a shield positioned to engage the yarn in advance of the detector, and connections between the detector and the shield to move the latter forwardly at a faster rate of speed than that at which the detector moves.

2. In a weft detector for looms, a detector having a detecting surface, a shield positioned to engage the yarn in advance of the detecting surface, and geared connections between the detector and the shield to movel the detector forward at a slower rate of speed than that at which the shield moves forwardly.

3. In a weft detector for looms, a detector having a detecting surface portions of which are formed to enter the yarn on the bobbin, and means connected to the detector and deriving motion from the bobbin to move the detecting surface forward at a different rate of speed from that at which the bobbin moves.

4. In a weft detector for looms, a detector having a `detecting surface portions of which are formed to enter the yarn on the bobbin, and means connected to the detector and deriving motion from the bobbin to move the detecting surface forward at a slower rate of speed fron'l that at which the bobbin moves. y

5. In a weft detector for looms, a detector having a detecting surface, a non-detecting surface positioned to engage the bobbin be` fore the latter engages the detecting surface, and means to move the non-detecting surface in the same direction in which the bobbin is traveling at a slow rate of speed until said detector is in full engagement with the bobbin and to thereafter move the non-detecting surface in the same direction in which the bobbin is moving but at a faster rate than that at which the bobbin is moving.

6. In a weft detector for looms, a detecting surface, a non-detecting surface positioned for engagement with the bobbin before the latter engages the detecting snrface, and differential gearing to move said surfaces at dierent rates of speed, to cause the bobbin irst to engage the non-detecting surface without engaging the detecting snrface and to thereafter engage the detecting Surface without engaging the non-detecting surface as the bobbin continues to move.

7. In a weft detector for looms, a detecting surface, a non-detecting surface positioned for engagement with the bobbin before the latter engages the detecting surface, and differential gearing to move said surfaces at different rates of speed.

8. In a weft detector for looms, a detector having a movement in the direction of the length of the bobbin at the time of indication of weft exhaustion, means acting to give said detector an angular movement as soon as the said detector moves forwardly, a shield to engage the bobbin before the detector engages the bobbin, means to move the detector forwardly with the bobbin at a slower rate of speed than that at which the bobbin is advancing, and means to prevent the detector from having an angular movement until after the shield has passed in front of the detecting surface of the angularly movable detector.

9.111 a detector for looms, a detector movable forwardly with the bobbin, means to engage the bobbin before the detector is engaged thereby, and means to move the detecting surface forwardly at a slower rate of speed than that at which the bobbin is moving for the first part of the detecting stroke and to thereafter permit the detecting surface to move forwardly with the bobbin in contact therewith at the same rate of speed at which the bobbin is moving.

10. In a weft detector for looms, a pairl of detectors, a carrier for said detectors, one of said detectors being angular-ly movable with respect to the other and movable on the carrier, a shield to engage the bobbin before either of those detectors is engaged by the saine, and geared connections between the shield and the carrier to move said carrier forwardly first at a slower rate of speed than that at which the bobbin is moving and then at the same rate of speed as that at which the bobbin is moving.

In testimony whereof I have hereunto aiixed my signature.

ELBRIDGE R. HOLMES.

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